4WEH10H4X/6EG12NTK4 SO43A-1058-A

The 4WEH10H4X/6EG12NTK4 SO43A-1058-A directional spool valve is produced by Bosch Rexroth for the WEH Directional Spool Valves series. It directs hydraulic flow in automated machinery where remote switching of pressure paths is needed. A 4-way configuration provides four ports that alternately connect or block pressure and return lines to cylinders or motors. The valve is built in size NG10 so it matches standard subplates for this nominal size. Electro-hydraulic actuation combines an electric pilot stage with a hydraulic main stage, allowing low-power control signals to shift the spool under full system pressure. A high-power 6E pilot valve supplies the pilot flow so the main spool moves quickly even when fluid viscosity rises. Pilot oil is taken externally through port X, which lets designers choose a clean, stable pilot source independent of load pressure. The pilot oil drains internally through port T, reducing external hoses. Hydraulic forces return the control spool to its neutral position when the solenoid de-energizes, and a manual override is provided so technicians can move the spool during commissioning or in the event of power loss.

The valve mounts on subplates drilled to the ISO 4401-05-05-0-05 porting pattern, enabling interchangeability with other NG10 components and speeding service swaps. A maximum operating pressure of 350 bar on ports P, A, and B permits use in high-pressure circuits such as presses or injection machines. The pilot circuit tolerates up to 250 bar, while the internal Y drain port withstands 210 bar, ensuring safe operation when back-pressure builds in the tank line. Rated flow reaches 160 l/min, giving adequate volume for medium-sized actuators without excessive pressure drop or heat generation. Electrical power is supplied through a DIN EN 175301-803 connector coded K4; the standardized plug makes coil replacement quick and maintains sealing against moisture. Attachment to the manifold uses four M6 × 45 screws, producing the clamping force required to hold the sealing plate against surge pressures. The specified fluid cleanliness of ISO 4406 20/18/15 sets the filtration level that prevents silting and keeps the spool moving freely throughout its service life.